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https://issues.apache.org/jira/browse/HBASE-8500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13651090#comment-13651090
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Rishit Shroff commented on HBASE-8500:
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Thanks Stack,
The idea is almost the same, the difference is that of disabling load balancer
vs blacklisting a region server. In 0.89 fb load balancer is responsible for
assigning regions to preferred nodes when a region server dies. So if we
disable the load balancer during a rolling restart, and some other region
server dies during that time, then the regions won't failover and get
reassigned. Because of this limitation in 0.89 fb, we went with the idea of
blacklisting the region server under restart so that the load balancer is on
and working fine. Only the region server under restart is not assigned new
regions by the load balancer.
I will take a look at the script and check if I can integrate any part of it
into this idea.
> RollingRestart utility at regionserver level
> --------------------------------------------
>
> Key: HBASE-8500
> URL: https://issues.apache.org/jira/browse/HBASE-8500
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.89-fb
> Reporter: Rishit Shroff
> Assignee: Rishit Shroff
> Priority: Minor
>
> With the option of blacklisting a region server from getting assigned new
> regions by the master, we need to have a utility which encapsulates this and
> uses it for rolling restart of a hbase cluster. The JIRA is to create a
> utility which restarts a single region server by:
> 1. blacklisting the region server
> 2. moving all the regions one by one
> 3. restart the region server process
> 4. moving all the regions back
> 5. removing the region server from blacklist
> Along with this, the utility should also be able to estimate the total outage
> observed from client perspective.
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